Accidentally Deleted amazon connect instance without releasing claimed phone number

what should i do to release the claimed phone number. I'm a student who is curious to learn amazon connect and started using for some time but now i was afraid if ill get charged for the number so please some one help me on how to release the phone number. The claimed amazon connect phone number is +44 2038302149.I tried for AWS technical support but its showing not available for basic account.AWS support team please release my number